farwell



(No Model.) 2 Sheets-Sheet 1.

W. B. FARWELL.

DRY ORE CONGBNTRATOR.

No. 274,581. Patented Mar.27,1883.

- In 275?? f0 2* N. PETERS. Phewuvw n hu, Washington. D. C.

(No Model.) 2 Sheets-Sheet 2.

W. B. PARWBLL.

DRY ORE GONGENTRATOR.

No; 274,581. V PatentedManZl, 1883.

Wf/HEESES: In Jen far:

jUNrrED STATES WILLARD B. FARX'VELL, OF NEW YORK, N. Y., ASSIGNOR Oh FIVEEIGHTHS, BY DIRECT AND MESNE ASSIGNMENTS, T JOHN LANDERS AND I. M. TAYLOR, OF SAN FRANCISCO, CALIFORNIA.

DRY=ORE CQNCENTRATOR.

SPECIFICATION forming part of Letters Patent No. 274,581, dated MarchQ'i, 1883,

' Application filed April 8, 1882.

To all, whom it may concern:

Be it known that LWILLAR'D B. FARWELL, of the city, county, and State of New York, at present sojourning in San Francisco, State of California, have invented certain new and useful Improvements in Ore-Concentrators; and I carried in a frame, to which a reciprocating motion is given over the ore-supportin g surface bymechanism that turns the blades at an angle and out of action when moving backward over the ore, and brings them into the perpendicular and into operation again at the return movement to come in contact with and move the upper portion of the ore-body forward and from off the lowest portion, and finally discharge it from the end of the bed.

My presentimprovem entconsists, first, in the means for suspending and operating the frame orcarriageinwhichthesescrapersare mounted, and in the mechanism for throwing the scrapers into and out of action.

It consists, also, in certain novel construction of bellows, actuating mechanism, and in devices for regulating the force of the blast.

In the drawings referred to in the following description by letters, Figure 1 shows an elevation in vertical section of a dry-ore concentrator constructed according to my invention. The section is taken longitudinally through the center of the machine. Fig. 2 is a crosssection taken through the line a: as, Fig. 1. Fi g. 3 is a side elevation of the machine.

A rectangular frame is formed of side slats, A A, and'cross-bars B B, to receive and carry the scrapers g g. Said frame is supported hori' zontally, and is reciprocated in a longitudinal direction over the ore-snpportin glued to operate the scraping-blades. These scraping-blades (No model.)

are pivoted in the sides of the frame at regu- 5o lar distances apart, and are required to take an inclined position out of contact with the ore during the movement of the carriage in one di rection, but to maintain a perpendicular position, so as to penetrate below the surface of the ore, while moving in the opposite direction, thereby moving the upper part of the orebody-regularly forward in one direction from one end to the other of the bed as the carriage or frame is moved back and forth. Such 6c movements and action I effect as follows: To the carriage A B, I give reciprocating motion from the shaft 0 through a pitman, D, pivoted to an upright post or standard, 6, on the outer end of the frame, and connected with a 6 5 crank on the center of the shaft. On the frame or carriage are provided upright suspension-bars or hangers b, to carry wheels or traction-rollers placed in pairs at the ends and at one or more intermediate points along 7::

the sides. These hangers have studs or short axles h It projecting horizontally outward over the side timbers, a: w, of the machine to form journals for the rollers I I, which, being grooved or fiangedto run upon horizontal rails w w, constitute the supporting-points of the carriage to maintain it in horizontal set position while allowing it to travel freely back and forth in the space between the sides of the machine. By this construction a smooth even movement is given to the scrapers, and all loose lateral play of this frame is prevented. The side slats of the carriage are therefore kept clear and out of contact with the sides of the machine-frame, between which it trav- 8 els, and the friction of'the running parts is greatly reduced. For cleaning and repairing the carriage and other parts of the machine this construction affords a means of readily detaching and removing the carriage from its riage, which is in a direction away from the 5 supply-hopper; but at the backward movement they are turned up so as to clear the ore. To throw these scrapers into and out of this vertical position I provide two stops, L M, one consisting of an adjustable screw, L, working through a block or fixed part of the machineframe, at the front end, and the other formed of a projecting bar or rod, M, fixed against the side of the supply-hopper. These two stops are set in line tostrike against the face of the outside blades, and below the center of oscillation in each outside one as the carriage finishes its movement in either direction. The backward motion of the carriage will therefore bring the face of the outside blade, or the first one of the set, against the stop M, and all the blades will be thrown into the vertical position before the carriage is moved forward, this action of the stop being transmitted to the whole set of blades by means of the connecting-bar P, to which each blade is pivoted at the point While being turned into this position a notch, q, upon the top of the bar P is brought back underneath and in line with the end of a gravity-pawl, It, that is hinged at r to the standard at the front end of the carriage over the bar P. This pawl holds the blades in working position during'the forward movement of the carriage. The other stop, L, operates after thesame manner to turn the blades into the required angular position as the forward movement is completed, and to hold them in such position while moving back, a second pawl, It, pivoted at r to the upright 11, is caused to engage with a notch, q, located on the bar P at such point in its length that the end of the pawl shall drop into this notch as the blades reach the required angle. Each pawl has'a downwardly bent end, and plays over a trip formed of bars or plates V, that project from the side of the machine-frame over the carriage, and are interposed in the path of the pawls R R in such manner as to throw their ends up out of the notches q q in the bar P, when the carriage approaches the end of travel in either direction. By the position of these tripping-bars one pawl is thrown out of action just before the blades are'turned and the other pawl comes into service, so that the stop at that end of the machine toward which the carriage is moving shall then be free to reverse the blades and bring the other pawl into play as the outer blade strikes it. These bars therefore throw the pawls alternately'out of action, while they drop by their own weight into place when their respective notches are brought into line. p

The ore-supporting bed consists of an endless belt or apron, W, carried over twohorizontal rollers, T T, that are mounted in compartments Q Q at the ends of the machine. This bed has a travel in a longitudinal direction against the movement and progression of the top portion of the ore-body, so that while this upper part is being carried forward and discharged from the front end by the action of the blades, the lowest portion of matter consisting of the metallic concentrations is being drawn backward, or to the opposite end of the machine, from beneaththe transverse slats z 2 by the intermittent movement given to the ore-bed. V v V In order to obtain the most efiective action of the air-blast againstthe ore, I find it desirable to have a period of rest in the ore-bed occur simultaneously with each blast,and then to produce the movements of the ore-bed during the intervals of interruption in the pulsations while the bellows is taking air. This intermittent movement of the ore-bed is produced from-the driving-shaft 0, through the agency of an eccentric, f, fixed on it at one end,-a rod, S, worked by this eccentric and extending to the rear end of the machine, and an upright rocking lever, J, to which the end of the rod is connected. This lever plays loosely on the journal of the rear roller T of the ore-supporting-bed against the side of a ratchet-wheel, N, fixed on the journal, and it carries a pawl, J, to engage with the ratchet-Wheel at each rocking movement of the lever in a backward direction, but to slip over the teeth of the wheel while being drawn forward. The eccentric on the driving-shaft is so timed with respect to the cranks by which the cross-heads 77 are worked that the lever is thrown forward at each downward stroke of the pitman, and the roller T is then rotated a certain distance while the bellows is taking air. This length of intermittent travel of the bed can be varied by making the attached end of the eccentric-rod adjustable upon thelever to and from the center of motion. For this purpose the end of this lever is provided with several holes for changing the length of stroke.

To regulate the depth of the concentrations that are carried out by this movement of the ore-bed, I provide a cut-oft, H, which is adjustable in its action upon the ore. It consists of a sliding plate fixed in guides upon the inner side of the hopper and projecting through the discharge-mouth over and across the orebed for the entire width of its working-surface. To move and adjust this cut-oft ahand-screw, j, working through a fixed nut, 70, on the hopper-back, is connected with the upper end of the plate. The manner of applying thismeans for setting the cut-off plate is shown in Fig. 1 of the drawings.

The bellows, beneath the perforate bed, con sists of the vibrating board 1, with. flexible sides 2 2 3 3, secured to its longitudinal and transverse edges,1and the usual air-inlets covered by the hinged flaps 4 4. The movements of this bellows to produce the pulsation of air are efiected from the single central shaft by means of the cranks 5 m the ends of theshaft, the pitman-bars 6 6, and the horizontal crossheads 7 7. The pitmen 6 are attached by the hinge-joints 8 to the center of the cross-heads 7, and these in turn are connected together by cross-slats 10 10, that pass across the machine from side to side underneath and against the bellows-bottom.

From each of the horizontal bars or crossheads 7 7 rods or small shafts l2,having bearings in the cross-heads, are carried across be-- heath the bellows, under the valves,to operate small eccentric disks or cams 13, fixed on the shafts in position just under the centers of the valves.

By means of hand-wheels 1 4 on the outer l lows requires to be modified or reduced.

This construction provides a simple means of operating all the parts of the machine from a single driving-shaft and also for regulating the ainblast while the machine is at work, by which the operation of concentration can be controlled with exactness, and the air-blast can be regulated in frequency and force or intensity as the ore being treated is found to vary in quality or richness.

Having thus fully described 'my invention, what I claim, and desire to secure by Letters Patent, is-

1. The combination, with he carriage or frame A, provided with the pivoted blades 9 g, of mechanism for imparting to said frame a horizontal reciprocating movement, and the stationary stops L M, for the purpose set forth.

2. The combination, with the carriage or frame A, provided with the pivoted blades 99 and the longitudinal notched rod P, of mechanism for giving longitudinal reciprocation to said carriage, the stationary stops L M, the gravity-pawls It It, the bars V, and the stationary frame, substantially as described.

3. The combination, with the side timbers, m as, rails w w, an ore-supporting bed, and the reciprocating carriage consisting of the longitudinal slats A, cross-bars B, upright hangers b b, the traction-rollers I I, and the post 6, of

the pitman D, the crank-shaft U, the set of blades 9 g, pivoted in the sides of the carriage, and means for turning said blades into and maintainingthem in the vertical position in one direction of their reciprocation and for turning and holding them in an inclined or angular position at and during the return, substantially as described and shown.

4. The combination of the bellowsbottom 1, the cross-heads 7 7 ,pitman-bars 6 6,the crankshaft, and the slats 10 10, connecting the crossheads together.

5. The combination of the bellows'bottom 1, having the valve-boards 4 4, with shafts 12, hand-wheels 14, and eccentrics l3, fixed in the centers of the shafts beneath the valves, substan tially as set forth.

' WILLARD B. FARWELL. [L. s]

\Vl tncsses EDWARD El ()snomv, D. SELLECK. 

